Interpreter---Python

Creation of the procedural programming language LPP.

This project implements a procedural programming language interpreter written in Python. It allows you to execute code written in the procedural language.

Requirements

• Python 3.9+
• mypy
• nose2

Installation

1. Clone the repository:

git clone https://github.com/Johan-FF/Interpreter---Python.git
cd Interpreter---Python

2. Create a virtual environment (optional but recommended):

python3.9 -m venv venv # Or python39 -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

3. Install the required dependencies:

pip install -r requirements.txt

Usage

1. To execute the procedural interpreter and run your procedural code (REPL), use the main.py file:

python39 main.py  # Or python3.9 main.py

Commands to REPL

• salir(): This it allow you exit of the REPL.

Built-in of LPP

• longitud(): Returns the length of a STRING in an INTEGER.

2. Running Tests

We use nose2 for running tests and mypy for type checking. To ensure everything is working correctly run:

mypy . && nose2

Getting Started in LPP

Let Statements

For declaring a value, you must use variable and give it a value. For example:

variable numero = 1                        # Interger
variable cadena_de_caracteres = "string"   # String
variable booleano = verdadero              # Boolean (Can be 'verdadero' or 'falso')

LPP allows data type as Integer, Boolean and String.

Operators

These are operators:

Operator	Symbol
Plus	+
Minus	-
Multiplication	*
Division	/
Negation	!
Equal	==
Not Equal	!=
Less than	<
Greater than	>

Functions

For declaring a function, you have to use the next syntax:

variable function_name = procedimiento ( param_1, param_2, ... ) {
    ...
    regresa param_1 + param_2 + ...;
}

For example:

variable obtener_suma = procedimiento ( x, y ) {
    regresa x + y;
}
obtener_suma(12, 4)  # Print 16

Conditionals

Regarding the conditionals, the syntax structure is:

si ( condition ) {
    ...
}
si_no {
    ...
}

For example:

variable mayor_de_edad = procedimiento( x ) {
    si ( x < 18 ) {
        regresa falso;
    }
    si_no {
        regresa verdadero;
    }
}
mayor_de_edad(18)  # Print 'verdadero'

Some Examples

    python39 main.py
LPP - v=0.1.1
Para salir ingresa salir().
>> variable factorial = procedimiento ( x ) { si ( x < 1 ) { regresa 1; } si_no { regresa x * factorial( x - 1 ); }; };
>> factorial(4)
24
>> variable factorial_4 = factorial(4)
>> si ( factorial_4 == 24 ) { variable resultado = "correcto"; } si_no { variable error = "incorrecto"; };
>> resultado
correcto
>> error
Error: Identificador no encontrado: error
>> longitud(resultado)
8
>> si ( !verdadero ) { "condicion verdadera"; } si_no { "condicion falsa"; };
condicion falsa
>> variable true  = verdadero;
>> si ( true ) { "Es cierto..."; }
Es cierto...
>> si ( !verdadero ) { "condicion verdadera"; } si_no { "condicion falsa"; };
condicion falsa
>> salir()

Contributing

Contributions are welcome! If you find any bugs or want to add new features, feel free to open an issue or submit a pull request.

Before submitting a pull request, please ensure that the tests pass and the code complies with the project's coding standards.